By Texas Instruments 77
Texas Instruments' bq50002 are highly integrated wireless power transmitter analog front ends that contain all of the analog components required to implement a WPC-compliant 5 V transmitter. The bq50002 integrate a full-bridge power driver with MOSFETs, variable-frequency oscillator, two-channel communication demodulator, linear regulator, and protection circuits. The bq50002 must be used together with the digital controller bq500511 to realize a compact two-chip wireless power transmitter solution. The bq500511 safely engage the RX device, receives packet communication from the powered device, and manage the power transfer according to WPC v1.2 specification.
The system supports foreign object detection (FOD) by continuously monitoring the amount of power transferred and comparing that to the amount of power received, as reported by the receiver. This protects against power loss to metal objects misplaced in the wireless power transfer field. In order to do this, the bq50002 measure the input DC current very accurately using a current sense amplifier. Should any abnormal condition develop during power transfer, the bq500511 handle it and provide indication outputs. Comprehensive status and fault monitoring features enable a low cost yet robust WPC-certified wireless power system design.
The bq50002 are available in a thermally enhanced 5 mm × 5 mm, 32-pin QFN package.
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